Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
Corticospinal Tract
|
-Begins in motor/premotor cortex
-Travels through ipsilateral internal capsule (cerebrum), cerebral peduncle (midbrain), medullary Pyramid -Lateral decussates at medullary pyramid(75-90%), Anterior decussates at spinal cord level (10-25%) -Synapse on motor neurons (10%) or interneurons (90%) in spinal cord |
|
Rubrospinal Tract
|
-Controls distal flexor tone, modulation of ongoing movement
-Originates in Red Nucleus (midbrain) -Decussates at Ventral Tegmental Decussation (midbrain) -Synapses on interneurons in laminae V-VIII |
|
Reticulospinal Tract
|
-Modulates spinla reflexes, tone in axial muscles for posture
-Begins in Pontine and medullary reticular formation -Pontien fibers descend uncrossed, medullary fibers can descend bilaterally -Synapse on gray matter motor neurons and interneurons |
|
Raphespinal Tract
|
-Modulation of pain transmission form spinal cord
-Begins in Dorsal Raphe Nucleus (midbrain) -Decussates at midbrain level -Synapses on interneurons in laminae I, II, V of s.c. |
|
Tectospinal Tract
|
-Head posture, reflexes and movement in response to visual stimuli
-Begins in Superior Colliculus (midbrain) -Decussates in Dorsal Tegmental Decussation(midbrain) -Projects bilaterally to motor neurons of axial neck and trunk muscles -Only in upper cervical levels |
|
Medial Vesibulospinal Tract
|
-Head and neck posture (flexors)
-Begins in Medial Vestibular Nucleus (medulla) as a continuation of MLF -No Decussation -Projects to motor neurons (IX) and interneurons (VIII) in cervical spinal cord levels |
|
Lateral Vestibulospinal Tract
|
-trunk posture/antgravity flexors
-Originates in Lateral vestibular nucleus (medulla) -No Decussation -Synapses on interneurons (VIII) and motor neurons (IX) mostly at lumbar levels |
|
Dorsal Column System
|
-Fine touch, pressure, vibration, spatially discriminitive position
-Cell bodies in DRG -Ascends as Fasciculus Cuneatus (arm-T6 and up) and Fasciculus Gracilis (leg) -Synapse at Nucleus cuneatus and Nucleus Gracilis in medulla -Decussates in medulla at pyramidal decussation -Fibers cross as internal arcuate fibers and continue as the Medial Lemniscus -Synapse in VPL nucleus of thalamus -Continue to Somatosensory cortex of parietal lobe |
|
Neospinothalamic Tract
|
-Part of ALS, crude pain, thermal sense, some crude touch
-sensors are free nerve endings that project to lamina II -Cell bodies in Lam I and V -Decussate at SC level -Project to VPL nucleus in thalamus -Continue to Somatosensory Cortex in parietal lobe |
|
Paleospinothalamic tract
|
-Crude touch. Part of ALS.
-Free nerve endings project to Lamina II on interneurons -cell bodies in Laminae VI-VIII -Decussates at spinal cord level -Projects to Intralaminar nucleus of thalamus -Continues to Cingulate nucleus of frontal lobe |
|
Spinomesencephalic Tract
|
-Modification of pain sensation at s.c. level
-Free nerve endings project to Lamina II -Cell bodies in laminae I and V -Decussates at SC level -Ascends to mesencephalic Reticular Formation/Raphe nuclei in periaqueductal grey |
|
Spinoreticular tract
|
-Part of ALS, crude pain
-Free nerve endings project to Lamina II -Cell bodies in Laminae VI-VIII -Decussates at spinal cord level -Ascends to Reticular Formation where it follows a multisynaptic path to the thalamus |
|
Dorsal Spinocerebellar Tract/Cuneocerebellar Tract
|
-Individual Muscle Sense
-Below C8: -Muscle spindles/golgi tendon organs send fibers into s.c. -Ascend to Clarke's Column/Nucleus Dorsalis (C8-L2) where cell bodies are located -No Decussation -Go to cerebellum through Inferior cerebellar Peduncle -Above C8: -Enter s.c. and ascend to External Cuneate Nucleus in medulla where cell bodies are located -tract continues to cerebellum through Inferior Cerebellar Peduncle |
|
Anterior Spinothalamic Tract
|
-Part of ALS, crude touch
-Free nerve endings project to Lamina II -Cell bodies in dorsal horn, can project bilaterally -Decussation at spinal cord level -Ascends to VPL nucleus ot thalamus -Continues to Somatosensory Cortex in Parietal Lobe |
|
Ventral/Anterior Spinocerebellar Tract
|
-joint/limb muscle information
-Golgi tendon Organs project to Spinal Border cells (V-VII) in dorsal horn -Decussate at spinal cord level and again in upper pons -Continue to cerebellum through Superior Cerebellar Peduncle |